28651212 has 48 divisors (see below), whose sum is σ = 75516000. Its totient is φ = 9391680.

The previous prime is 28651211. The next prime is 28651213. The reversal of 28651212 is 21215682.

It is a happy number.

28651212 is a `hidden beast` number, since 2 + 8 + 651 + 2 + 1 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (28651211) and next prime (28651213).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28651211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4414 + ... + 8762.

It is an arithmetic number, because the mean of its divisors is an integer number (1573250).

Almost surely, 2^28651212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28651212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37758000).

28651212 is an abundant number, since it is smaller than the sum of its proper divisors (46864788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28651212 is a wasteful number, since it uses less digits than its factorization.

28651212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4423 (or 4415 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 28651212 is about 5352.6826918845. The cubic root of 28651212 is about 305.9950018407.

Adding to 28651212 its reverse (21215682), we get a palindrome (49866894).

The spelling of 28651212 in words is "twenty-eight million, six hundred fifty-one thousand, two hundred twelve".